be.SIRAPRISE.ra

Class EXTEND

java.lang.Object

be.SIRAPRISE.ra.RelationalOperator

be.SIRAPRISE.ra.EXTEND

public abstract class EXTEND
extends RelationalOperator

Author:

erwin

Constructor Summary

Constructors

Constructor and Description
EXTEND()

Method Summary

Modifier and Type	Method and Description
static RelationBuffer	computeExtend(RelationBuffer relationBuffer, java.util.Map<NameIdentifier,java.lang.String> extendExpressions)
static Relation	computeExtend(Relation relation, java.util.Map<NameIdentifier,java.lang.String> extendExpressions)
int	getMaximumArgumentCount() Gets the maximum argument count for this operator.
int	getMinimumArgumentCount() Gets the minimum argument count for this operator.
java.lang.String	getName() Gets the operator name
boolean	isMonoRelationOperator() Checks if the operator takes only one Relation as input

Methods inherited from class be.SIRAPRISE.ra.RelationalOperator

toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

EXTEND

public EXTEND()

Method Detail

computeExtend

public static Relation computeExtend(Relation relation,
                                     java.util.Map<NameIdentifier,java.lang.String> extendExpressions)

Parameters:

relation - the relation to be extended

extendExpressions - the extend expressions to be evaluated for each tuple

Returns:

the extended relation

computeExtend

public static RelationBuffer computeExtend(RelationBuffer relationBuffer,
                                           java.util.Map<NameIdentifier,java.lang.String> extendExpressions)

Parameters:

relationBuffer - the relationbuffer holding the tuples to be extended

extendExpressions - the extend expressions to be evaluated for each tuple

Returns:

the relationbuffer holding the extended tuples

getMaximumArgumentCount

public final int getMaximumArgumentCount()

Description copied from class: RelationalOperator

Gets the maximum argument count for this operator. Note that stuff like rename lists are regarded as an argument as far as this count is concerned

Specified by:

getMaximumArgumentCount in class RelationalOperator

Returns:

the maximum argument count for this operator.

getMinimumArgumentCount

public final int getMinimumArgumentCount()

Description copied from class: RelationalOperator

Gets the minimum argument count for this operator. Note that stuff like rename lists are regarded as an argument as far as this count is concerned

Specified by:

getMinimumArgumentCount in class RelationalOperator

Returns:

the minimum argument count for this operator

getName

public final java.lang.String getName()

Description copied from class: RelationalOperator

Gets the operator name

Specified by:

getName in class RelationalOperator

Returns:

the operator name

isMonoRelationOperator

public final boolean isMonoRelationOperator()

Description copied from class: RelationalOperator

Checks if the operator takes only one Relation as input

Specified by:

isMonoRelationOperator in class RelationalOperator

Returns:

true if the operator takes only one Relation as input